Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 57: Quantum Gases II

Q 57.6: Poster

Thursday, March 17, 2022, 16:30–18:30, P

Exploration of spin imbalanced few fermion systems in position and momentum space — •Sandra Brandstetter, Carl Heintze, Keerthan Subramanian, Marvin Holten, Philipp Preiss, and Selim Jochim — Physics Institute, University of Heidelberg, Germany

Recent advances in the preparation of ultracold few-fermion systems combined with a spin resolved TOF imaging technique with single particle resolution, have led us to the first observation of Cooper pairs of interacting atoms [1]. However, the exploration of correlations in real space has so far remained elusive, owing to the small system size, which we can't resolve with our optical imaging setup.

In this poster we present the addition of a matter wave microscopy scheme [2], enabling us to access the spatial distribution of our atoms. While it is too small to resolve with our imaging setup, we can magnify it using a combination of two T/4 evolutions in traps with different trapping frequencies.

Additionally, we have recently achieved the preparation of imbalanced systems with different number of particles in the two spin states. Combining this with our access to both the momentum and real space correlations, we aim to explore open questions on the nature of the phase diagram and pairing in spin imbalanced systems [3,4].

[1] M. Holten, et al. arXiv:2109.11511 (2021).

[2] L. Asteria et al. Nature 599, 571*575 (2021).

[3] R. Schmidt and T. Enss. Phys. Rev. A 83 (2011)

[4] Felipe Attanasio et al. 2021. arXiv: 2112.07309 (2021)